382 MR T. C. BAILLIE ON THE ABSOLUTE THERMAL CONDUCTIVITY OF NICKEL. 



the value of the specific heat of nickel found by using nickel turnings, viz., *11, would, if 

 multiplied by the ratio of the conductivity to the specific heat at the mean temperature 

 60°, give a result in exact agreement with the above. It should, however, be stated that 

 the specimen of nickel showed slight fissures. These were not serious enough to affect 

 the readings sufficiently to make it noticeable in the appearance of the temperature 

 curves, and the readings obtained from the Forbes bar do not show irregularities from 

 such a cause. The nickel used was also very pure. I am much indebted to my col- 

 league, Mr F. V. Dutton, for analysing it for me with the following result :— 



Aualysis of Nickel. 



Manganese, 

 Magnesium, 

 Iron, 

 Nickel, 



1-63 



per 



cent 



0-28 





ii 



0-75 







97-22 





n 



Total, . . . 99-88 



The Forbes's method experiments were carried out in Edinburgh University Physical 

 Laboratory ; the other method was done in the Physical Laboratory of the University 

 College of North Wales, and from time to time the work was carried on partly in 

 Edinburgh, partly in Bangor. I have to thank Professor Tait and Professor Gray for 

 affording me every facility in carrying out these determinations. 



EXPLANATION OF FIGURES. 



Fig. 2. A. Gas supply. 



B. By-pass. 



C. Tube leading gas to burner. 



D. Opening for letting out mercury to regulate temperature of cut-off. 



E. Place at wbicb mercury acts on gas supply. 



F. Glass flask containing mercury. 



G. Argand gas burner. 

 H. Mercury. 



J. Cast-iron pot. 



K. End of bar heated. 



L. Thermometers. 



M. Bar of Nickel. 



N. Brass cap. 



O. Water inlet with thermometer. 



P. Water outlet with thermometer. 



Q. Flask for measuring rate of flow of water. 



R. Inverted bottle ) , , , 



S. Water tank } <>n reduced scale. 



Fig. 3. A, B, C. Tubulures for thermometers containing Wood's alloy. 



D. Gas burner. 



E. Chamber of water or naphthalene. 

 K. Open end of apparatus. 



L, M. Asbestos screens. 



